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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d561caa39e317223319533c681dc0a0c3b81d30755db0b72cf03c96d813aa22' 
  AND token = 'E/lTc65WElh7pktre3kNCil+3wfUItzgXCit1w7sZJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}